Relationship between critical temperature and core orbital coupling in cuprate superconductors

Zhao, Bo; Chen, Ning

doi:10.1016/j.physc.2016.02.001

Cited by 4 publications

(2 citation statements)

References 38 publications

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“…Motivated by recent developments in twisted van der Waals materials [21][22][23][24][25][26][27][28][29] , a new route toward topological superconductivity (TSC) has been proposed recently which takes two monolayers of high-T c cuprate superconductor with nodal d x 2 Ày 2 pairing symmetry, such as Bi 2 Sr 2 CaCu 2 O 8+δ , stacked with a relative angular twist θ 30,31 . At θ ≃ 45 ∘ , the bilayer is predicted to enter a fullygapped, topological chiral d ± id 0 phase with spontaneously broken time-reversal symmetry T , which has been tentatively identified in a recent experimental study 32 . Despite its promise for realizing high-T c TSC, a chiral d ± id 0 superconductor cannot host truly non-Abelian excitations due to its spin-singlet pairing nature, which is always associated with an even number of MZMs that combine to form usual Abelian fermions.…”

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confidence: 58%

Non-Abelian topological superconductivity in maximally twisted double-layer spin-triplet valley-singlet superconductors

et al. 2023

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Recent studies point to an exotic spin-triplet valley-singlet (STVS) superconducting phase in certain two-valley electron liquids, including rhombohedral trilayer graphene, Bernal bilayer graphene and ZrNCl, which nevertheless admits only trivial topology. Here, we predict that upon twisting two layers of STVS superconductors, a chiral $$f\pm {{{{{{{\rm{i}}}}}}}}{f}^{{\prime} }$$ f ± i f ′ -wave superconducting phase emerges near the ‘maximal’ twist angle of 30∘ where the system becomes an extrinsic quasi-crystal with 12-fold tiling. The resulting composite hosts an odd number of chiral Majorana edge modes and a single non-Abelian Majorana zero mode (MZM) in the vortex core. Through detailed symmetry analysis and microscopic modelling, we demonstrate that the non-Abelian topological superconductivity (TSC) forms robustly near the maximal twist when the isolated Fermi pockets coalesce into a single connected Fermi surface in the moiré Brillouin zone. Our results establish the large-twist-angle engineering, with distinct underlying moiré physics from magic-angle graphene, as a viable route toward non-Abelian TSC.

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confidence: 58%

Non-Abelian topological superconductivity in maximally twisted double-layer spin-triplet valley-singlet superconductors

et al. 2023

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“…Our technique provides a unique opportunity to address and solve fabrication-related problems with BSCCO. The cryogenic pick-up and transfer method we have developed is motivated by the work of Zhao et al 25 and improves upon it. We realize more control of the meniscus by using the hemispherical PDMS stamps 26 and exploit the glass transition of PDMS at -120 °C to exfoliate the crystal rather than using external mechanical force.…”

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confidence: 99%

Pick-up and assembling of chemically sensitive van der Waals heterostructures using dry cryogenic exfoliation

Patil,

Ghosh,

Basu

et al. 2024

Sci Rep

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Assembling atomic layers of van der Waals materials (vdW) combines the physics of two materials, offering opportunities for novel functional devices. Realization of this has been possible because of advancements in nanofabrication processes which often involve chemical processing of the materials under study; this can be detrimental to device performance. To address this issue, we have developed a modified micro-manipulator setup for cryogenic exfoliation, pick up, and transfer of vdW materials to assemble heterostructures. We use the glass transition of a polymer PDMS to cleave a flake into two, followed by its pick-up and drop to form pristine twisted junctions. To demonstrate the potential of the technique, we fabricated twisted heterostructure of Bi2Sr2CaCu2O8+x (BSCCO), a van der Waals high-temperature cuprate superconductor. We also employed this method to re-exfoliate NbSe2 and make twisted heterostructure. Transport measurements of the fabricated devices indicate the high quality of the artificial twisted interface. In addition, we extend this cryogenic exfoliation method for other vdW materials, offering an effective way of assembling heterostructures and twisted junctions with pristine interfaces.

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Effects of Tl content and magnetic field on phase formation of TlmBa2Can-1CunO2n+2+δ (m=1 and 2, n=4) superconductors

Hassan

Alnakhlani

Abdulhafiz

2021

Physica C: Superconductivity and its Applications

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Relationship between critical temperature and core orbital coupling in cuprate superconductors

Cited by 4 publications

References 38 publications

Non-Abelian topological superconductivity in maximally twisted double-layer spin-triplet valley-singlet superconductors

Non-Abelian topological superconductivity in maximally twisted double-layer spin-triplet valley-singlet superconductors

Pick-up and assembling of chemically sensitive van der Waals heterostructures using dry cryogenic exfoliation

Effects of Tl content and magnetic field on phase formation of TlmBa2Can-1CunO2n+2+δ (m=1 and 2, n=4) superconductors

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